Got a 2001 Cobra IRS coming in in the next week or two that is going to go in my 1986 SVO. Anyone got any advice regarding the swap, dos/donts, parts, etc?
SVO has a 7.5” diff like the V6, that’s a good point I hadn’t thought about. I guess I’ll need to track down a V8 driveshaft or have mine shortened. Thinking Prothene bushings and SPC cross axis joints if I need them, and I’ll probably fab my own brake lines to split off th existing ones.
It won’t just be a street car. This is intended to be a weekend toy and autocross car, with occasional mountain time. Will the delrin really make that big a difference compared to poly in a turbo 4 cylinder car that doesnt spool up until almost 3000rpm?
I wouldn’t even be considering anything else if I wasn’t doing this on a college kid’s budget tbh. I thought wheel hop was a launching issue only?
So here’s my thought process then, based on this new to me information: FTBR subframe and diff bushings, with stock rubber where needed in the control arms. Does that sound like a bad plan for a budget weekend street car with occasional autocross or mountain driving?
Kenny Brown used to have a video of all the deflection an IRS goes through during aggressive driving. They used to make control arms for IRS years ago. My cars hardly ever see track time. Occasional burn outs and hard pulls.
Several years ago I had a couple customers with what they called wheel hop. The issue was that the driveshafts were too long and causing a vibration. The front bushings on the differential were also worn on both of them. On my current IRS I have shims made from washers to tighten up the front bushings. Its somewhere in my build thread. I have tracked this IRS in the past and noticed a little snap out of hard corners. ( always thought that was because of the stock control arm bushings ). The most power I've seen is about 300hp at the tires. My current set up should be at least 400hp at the tire ( turbo 331 9psi. ). I haven't gotten on it enough to know if I'll start having IRS hop issues.
One must is aftermarket tie rods. Mine have bent several times over the years. I've been cheap and using stock ones from customers upgraded units. This time I'm ordering good ones. Mine bent on a pull to full boost while data logging . In the past I can't pin point when they bent. Just noticed while wrenching or when checking the alignment. This time they are bent significantly more.